Tex. Government Code § 25.0027

The drawing of jury panels, selection of jurors, and practice in the statutory probate courts must conform to that prescribed by law for county courts, except that practice, procedure, rules of evidence, issuance of process and writs, juries, including the number of jurors provided the parties to a proceeding may agree to try a particular case with fewer than 12 jurors, and all other matters pertaining to the conduct of trials and hearings in the statutory probate courts involving those matters of concurrent jurisdiction with district courts are governed by the laws and rules pertaining to district courts.